21121111022010 has 64 divisors (see below), whose sum is σ = 52898680240128. Its totient is φ = 5386999109184.

The previous prime is 21121111021993. The next prime is 21121111022059. The reversal of 21121111022010 is 1022011112112.

It is a happy number.

It is a super-2 number, since 2×21121111022010² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7841829 + ... + 10185111.

It is an arithmetic number, because the mean of its divisors is an integer number (826541878752).

Almost surely, 2^{21121111022010} is an apocalyptic number.

21121111022010 is an abundant number, since it is smaller than the sum of its proper divisors (31777569218118).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21121111022010 is a wasteful number, since it uses less digits than its factorization.

21121111022010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2356379.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21121111022010 its reverse (1022011112112), we get a palindrome (22143122134122).

The spelling of 21121111022010 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred eleven million, twenty-two thousand, ten".